High severity · published Oct 22, 2026
CVE-2026-114637
Traefik v3.2.0 before v3.7.14 FastProxy NTLM/Negotiate Connection Pool Identity Leak
New
8.7
CVSS
0.3%
EPSS
No
On KEV
Description
Traefik from v3.2.0 before v3.7.14 contains an authentication bypass vulnerability in the experimental FastProxy connection pool, which fails to pin NTLM/Negotiate-authenticated backend connections to their frontend connection. Unauthenticated clients can be handed a pooled keep-alive backend connection where a victim completed an NTLM or Negotiate handshake, letting them read victim data and act as that victim.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 22% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
TR
traefik · traefik
3.2.0 before 3.7.14 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-114637
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-114637
Vendor Advisory
https://github.com/traefik/traefik/security/advisories/GHSA-53qr-784g-cj35
Third Party Advisory
https://www.vulncheck.com/advisories/traefik-3.2.0-before-3.7.14-fastproxy-ntlm-negotiate-connection-pool-identity-leak
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